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Steel Making

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

ANNEALING can be done by heating to temperatures ranging from...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Steel is hardened by quenching from above the upper critical....

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

An Automatic Temperature Control Pyrometer


Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.

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Previous: Brown Automatic Signaling Pyrometer

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